<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>圣杯布局</title>
  <link rel="stylesheet" href="./圣杯布局.css">
</head>

<body>
  <div class="contain">
    <div class="center">
      中间部分
    </div>
    <div class="left">
      1
    </div>
    <div class="right">
      2
    </div>
  </div>

</body>

</html>